Method of making rubber cushion material



Jan. 27, 1942. w. BINNS 5 METHOD OF MAKING RUBBER CUSHION MATERIAL Filed Sept. 27, 1958 Patented Jan. 27, 1

METHOD OF MAKING RUBBER CUSHION MATERIAL William Binns,

one-half to Bintex,

England, a company 0 Bradford, England, assignor of Limited, Leeds, Yorkshire,

1. Great Britain Application September 27, 1938, Serial No. 231,974 In Great Britain September 28, 1937 2 Claims. (01. 18-59) This invention relates to improvements in rubber cushioning material.

According to the present invention a rubber cushioning material comprises a body of porous or microporous rubber shaped or formed at its back to provide a plurality of like forming air pockets,

secured to the rubber and channels or the and a flexible backing conforming to the tional elevation ing material, and Figure of a preferred form of cushion- 2 a diagrammatic view of apparatus for producing the cushioning material.

Referring to the drawing terial is produced by a unwinding a web I of continuous belt support the cushioning macontinuous process by textile fabric on to a 2 on the surface of which are provided a series of curved projections 3. A device of any s 4 to press the web I the projections, the

uitable kind is provided at into the spaces between device being driven synchronously with the movement; of the belt. The

belt with the web thus positioned a hopper or the like 5 from which an incoagu- U 6 pours on to the fabric, and

lated latex foam passes under then under a fixed roll I, scraper or like member which smoothes off latex to leave a layer of the fabric. a heating chamber canised and coagulated,

the top surface of the the required depth on Thereafter the belt passes through 8 where the latex is vuland finally the coated fabric is removed at 9 from the belt and rolled up or otherwise stacked When the cushioning for squabs for chairs and until required for use. material is employed the like, suitable pieces of the material are taken, comprising as shown in Figure 1 the sponge rubber body 6 backed with the fabric l, and are secured as by adhesive to rigid backings ll of plywood or other suitable material and the upper surface covered with fabric III or with a, thin solid rubber facing, preferably secured by adhesive tothe rubber body 6. 5

If desired cellular cushioning material may be made by securing two portions of similar cushioning material, comprising the backing I and sponge rubber 6, back to back.

It is possible by reason of the support provided by the backing to employ an extremely light sponge or-foam-e. g. a 16-20 volume latex sponge-produced in any known manner, with the consequence that the material is very considerably lighter and cheaper than known cushioning material composed solely of a rubber latex sponge.

What I claim is:

1. Process for the manufacture of rubber cushioning material which comprises applying a textile web to a moving conveyor band with a corrugated surface, pressing said textile web into the corrugations of said surface whereby the textile web is correspondingly corrugated, applying a latex foam to said textile web while it is on the band in a quantity more than sufllcient to fill the corrugations of 'said textile web, passing the coated web under a member which levels the upper surface of the latex foam, passing said coated textile while it is still on the band and corrugated through a heated chamber to coagulate the latex foam.

2. Process as claimed in claim 1, and in which the latex foam is produced from a vulcanisable mix and is vulcanised in the heated coagulation chamber.

WILLIAM BINNS.

and then- 

